Smartphone case



FIG. 1 is a front view of a smartphone case;

FIG. 2 is a front isometric view thereof; and,

FIG. 3 is a partial enlarged front isometric view, taken from the circle 3 in FIG. 2.

The dot-dash broken line circles in FIGS. 2 and 3 are included for the purpose of illustrating the enlarged view and form no part of the claimed design. The dashed broken lines depict unclaimed subject matter. The broken lines and unshaded surfaces form no part of the claimed design. 

CLAIM The ornamental design for a smartphone case, as shown and described. 